Desperate:DL580G5: what is broken, HP or VMware? :-/

Hi,

Since a month i have this server running ESX4U1. Whenever machines get deployed to it, sometimes within 15mins, sometimes after 60misn the server becomes unresponsive. The only thing possible is pushing ALT+F12 to look at the vmkernel log showing vscsi errors (see screenshot).

Is anyone recognizing this problem or that can point out what is going wrong? Even the P400 controllercard was replaced today but the problem sticks.